| 适用于中深层-深层页岩气的高压吸附模型 |
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| 引用本文： | 任文希,周玉,郭建春,王天宇.适用于中深层-深层页岩气的高压吸附模型[J].地球科学,2022,47(5):1865-1875. |
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| 作者姓名： | 任文希 周玉 郭建春 王天宇 |
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| 作者单位： | 1.西南石油大学油气藏地质及开发工程国家重点实验室，四川成都 610500 |
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| 基金项目： | 国家自然科学基金青年基金资助项目（No.52004239）；;油气资源与探测国家重点实验室开放课题基金项目（No.PRP/open-2003）； |
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| 摘 要： | 我国目前开发的中深层-深层页岩气藏储层压力高.低压下的吸附实验和理论难以满足勘探开发的需要.针对这一问题，对Uniform Langmuir模型进行了修正，发展了一个适用于中深层-深层页岩气的高压吸附模型，即修正的Uniform Langmuir（Unilan）模型.然后，利用文献发表的高压吸附实验数据对修正的Unilan模型进行了验证，并与其他高压吸附模型进行了对比，发现:相对于其他高压吸附模型，修正的Unilan模型具有拟合参数少和精度高的优点.最后，基于拟合得到的Unilan模型参数，结合页岩样品矿物组成，开展了模型参数分析，发现:有机质和黏土矿物对页岩气吸附均有贡献；吸附达到饱和时的吸附相体积大于微孔体积且小于总孔体积；吸附熵变主要与吸附态甲烷分子-页岩的相互作用强度有关.
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| 关 键 词： | 页岩气 高压吸附 吸附模型 吸附能 吸附熵变 油气地质 |
| 收稿时间： | 2021-10-07 |
High-Pressure Adsorption Model for Middle-Deep and Deep Shale Gas |
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| Ren Wenxi,Zhou Yu,Guo Jianchun,Wang Tianyu.High-Pressure Adsorption Model for Middle-Deep and Deep Shale Gas[J].Earth Science-Journal of China University of Geosciences,2022,47(5):1865-1875. |
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| Authors: | Ren Wenxi Zhou Yu Guo Jianchun Wang Tianyu |
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| Abstract: | The development depth is mostly greater than 2 000 m in major shale gas producing areas of China. As burial depth increases, reservoir pressure increases. The experimental and theoretical study of shale gas adsorption under low pressure is not suitable for the development of medium-deep and deep shale gas reservoirs. Thus, it modified the Uniform Langmuir model, and developed a high-pressure methane adsorption model, i.e., the modified Uniform Langmuir(Unilan)model. Then, we used the published experimental data under high pressure to validate the modified Unilan model. Moreover, we compared the modified Unilan model with other high-pressure adsorption models. It is found that the modified Unilan model with less fitting parameters is characterized by high precision, compared with other high pressure adsorption models. Finally, we investigated the fitted model parameters based on the mineral composition of the used shale samples. It is found that the adsorption capacity of shale is mainly controlled by organic matter and clay. Moreover, the volume of the adsorbed phase at maximum adsorption capacity is greater than micropore volume, but is less than total pore volume. Adsorption entropy change is mainly controlled by the interaction strength between adsorbed methane molecules and shale. |
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